BUG: Fixed transform translation slider instability in rotate first mode

How to reproduce the problem:

1. Create a new Transform
2. Switch to 'rotate first' mode (pushbutton pressed)
3. Drag the LR translation slider to 200
4. Drag the AP slider to 1 and back to 0
5. Drag the LR translation slider to the rightmost position
   => ERROR: the translation jumps to tens of thousands (instead of the expected 400)

Fix: Don't update the translation slider range if in 'rotate first' mode. Set the matrix range to a fixed large value to allow larger translation values in the matrix than the slider range.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24516 3bd1e089-480b-0410-8dfb-8563597acbee